<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<table border="1" width="500" align="center">

    <tr>

        <td colspan="3" align="center" height="100">网站头部</td>
    </tr>
    <tr>
        <td width="150">网站标题</td>
        <td colspan="2" align="right">搜索框</td>
    </tr>
    <tr>
        <td height="200">左</td>
        <td>中</td>
        <td>右</td>
    </tr>
    <tr>
        <td colspan="3" align="center">网站底部</td>
    </tr>
</table>
</body>
</html>